34 31 181 Removing and installing / replacing expansion tank for hydraulic brake actuation

WARNING: This page is about a different car, the 2007 BMW 550i, 2006 BMW 550i, 2005 BMW 545i, and 2004 BMW 545i. However, it is still accessible from the selected car via links, so may be relevant.

Necessary Preliminary Tasks:

Remove lower section of microfilter housing. Refer to 64 31 061 REMOVING AND INSTALLING/REPLACING LEFT OR RIGHT MICROFILTER HOUSING LOWER SECTION .
Read and comply with General Information. Refer to 34 00 ... GENERAL INFORMATION .

Suck the brake fluid out of the expansion tank. Use suction bottle exclusively to draw off brake fluid.

IMPORTANT: Do not reuse drawn out brake fluid.

Fig 1: View Of Expansion Tank

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Unfasten plug connection (1) and disconnect.

Release retaining screw (2).

Installation:

Tightening torque, refer to 34 31 3AZ in BRAKES - TIGHTENING TORQUES - E60 .

Pull expansion tank vertically out of brake master cylinder.

Fig 2: Releasing Retaining Screw

Courtesy of BMW OF NORTH AMERICA, INC.

Installation:

Check rubber plug in brake master cylinder for damage and replace if necessary.

Push the expansion tank vertically onto the master brake cylinder.

Fig 3: Installing Expansion Tank Into Brake Master Cylinder

Courtesy of BMW OF NORTH AMERICA, INC.